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Tianhe-2, a supercomputer developed by China's National University of Defense Technology, retained its position as the
world's No. 1 system with a performance of 33.86 petaflop/s on
the Linpack benchmark.

According to the 42nd edition of the twice-yearly TOP500 list
of the world?s most powerful supercomputers announced Nov. 18
at the SC13 conference in Denver, Colo, Titan, a Cray XK7
system installed at the Department of Energy's (DOE) Oak Ridge
National Laboratory, remains the No. 2 system. It achieved
17.59 Pflop/s on the Linpack benchmark. Titan is one of the
most energy efficient systems on the list consuming a total of
8.21 MW and delivering 2.143 gigaflops/W.

Sequoia, an IBM BlueGene/Q system installed at DOE's Lawrence
Livermore National Laboratory, is again the No. 3 system. It
was first delivered in 2011 and achieved 17.17 Plop/s on the
Linpack benchmark.

Fujitsu's K computer installed at the RIKEN Advanced Institute
for Computational Science (AICS) in Kobe, Japan, is the No. 4
system with 10.51 Pflop/s on the Linpack benchmark.

Mira, a BlueGene/Q system installed at DOE's Argonne National
Laboratory, is No. 5 with 8.59 Plop/s on the Linpack benchmark.

The new entry in the TOP10 is at No. 6 - Piz Daint, a Cray XC30
system installed at the Swiss National Supercomputing Centre
(CSCS) in Lugano, Switzerland and now the most powerful system
in Europe. Piz Daint achieved 6.27 Pflop/s on the Linpack
benchmark. Piz Daint is also the most energy efficient system
in the TOP10 consuming a total of 2.33 MW and delivering 2.7
Gflops/W.

Rounding out the TOP10 are Stampede at the Texas Advanced
Computing Center of the University of Texas, Austin, which
slipped to No. 7; a BlueGene/Q system called JUQEEN installed
at the Forschungszentrum Juelich in Germany is No. 8; No. 9 is
taken by Vulcan, another IBM BlueGene/Q system at Lawrence
Livermore National Laboratory; and No. 10 is the third system
in Europe, the SuperMUC, installed at Leibniz Rechenzentrum in
Germany.

Highlights from the November 2013 TOP500 List, which can be
found at www.top500.org, include:

- In all, there are 31 systems with performance greater than a
petaflop/s on the list, an increase of five compared to the
June 2013 list.

- The No. 1 system, Tianhe-2, and the No. 7 system, Stampede,
are using Intel Xeon Phi processors to speed up their
computational rate. The No. 2 system Titan and the No. 6 system
Piz Daint are using NVIDIA GPUs to accelerate computation.

- A total of 53 systems on the list are using
accelerator/co-processor technology, unchanged from June 2013.
Thirty-eight (38) of these use NVIDIA chips, two use ATI
Radeon, and there are now 13 systems with Intel MIC technology
(Xeon Phi).

- Intel continues to provide the processors for the largest
share (82.4 percent) of TOP500 systems.

- Ninety-four percent of the systems use processors with six or
more cores and 75 percent have processors with eight or more
cores.

- The number of systems installed in China has now stabilized
at 63, compared with 65 on the last list. China occupies the
No. 2 position as a user of HPC, behind the U.S. but ahead of
Japan, UK, France, and Germany. Due to Tianhe-2, China this
year also took the No. 2 position in the performance share,
topping Japan.

- The last system on the newest list was listed at position 363
in the previous TOP500.

In addition, the U.S. is the leading consumer of HPC systems
with 265 of the 500 systems (253 last time). The European share
(102 systems compared to 112 last time) is still lower than the
Asian share (115 systems, down from 118 last time).

Dominant countries in Asia are China with 63 systems (down from
65) and Japan with 28 systems (down from 30).

In Europe, UK, France, and Germany, are almost equal with 23,
22, and 20 respectively.

The TOP500 list is compiled by Hans Meuer of the University of
Mannheim, Germany; Erich Strohmaier and Horst Simon of Lawrence Berkeley National Laboratory; and Jack Dongarra of the
University of Tennessee, Knoxville.